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  <p>
    Reports incorrect event namespace declarations in an event script file.
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  <p>
    Event namespace should be in correct format.
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  <p>
    In detail,
    an event namespace should only contain letters, digits and underlines.
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  <p>
    In an event script file,
    the event namespace is declared as the root property of the file (named "namespace") before event definitions.
  </p>
  <p>
    An event script file is a script file with extension ".txt" under directory <code>events</code> or it's subdirectories.
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